18768382281 has 12 divisors (see below), whose sum is σ = 29574420720. Its totient is φ = 11374777080.

The previous prime is 18768382277. The next prime is 18768382289. The reversal of 18768382281 is 18228386781.

18768382281 is a `hidden beast` number, since 187 + 6 + 8 + 382 + 2 + 81 = 666.

It is not a de Polignac number, because 18768382281 - 2² = 18768382277 is a prime.

It is a super-2 number, since 2×18768382281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18768382289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94789711 + ... + 94789908.

It is an arithmetic number, because the mean of its divisors is an integer number (2464535060).

Almost surely, 2^18768382281 is an apocalyptic number.

18768382281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18768382281 is a deficient number, since it is larger than the sum of its proper divisors (10806038439).

18768382281 is a wasteful number, since it uses less digits than its factorization.

18768382281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189579636 (or 189579633 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The spelling of 18768382281 in words is "eighteen billion, seven hundred sixty-eight million, three hundred eighty-two thousand, two hundred eighty-one".